<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>The fixed background should not cause .inner to move to a different layer than .outer</title>

<style>

body {
  margin: 0;
  height: 3000px;
}

.outer {
  border: 1px solid black;
  margin: 10px;
}

.outer > div {
  margin: 10px;
}

.fixed-bg {
  height: 100px;
  background-image: linear-gradient(lime, lime);
  background-attachment: fixed;
}

.inner {
  border: 1px solid blue;
  padding: 20px;
}

</style>

<div class="outer" reftest-assigned-layer="page-background">
  <!-- .inner and .fixed-bg do not overlap, so .inner should be merged into
       the same layer as .outer. -->
  <div class="fixed-bg"></div>
  <div class="inner" reftest-assigned-layer="page-background"></div>
</div>
